[PATCH] Kdump: Export crash notes section address through sysfs
o Following patch exports kexec global variable "crash_notes" to user space
through sysfs as kernel attribute in /sys/kernel.
Signed-off-by: Maneesh Soni <maneesh@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
index 59b92d2..3645ad7 100644
--- a/arch/i386/kernel/crash.c
+++ b/arch/i386/kernel/crash.c
@@ -26,8 +26,6 @@
#include <asm/apic.h>
#include <mach_ipi.h>
-#define MAX_NOTE_BYTES 1024
-typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
note_buf_t crash_notes[NR_CPUS];
diff --git a/arch/x86_64/kernel/crash.c b/arch/x86_64/kernel/crash.c
index 7caf8a4..6183bcb 100644
--- a/arch/x86_64/kernel/crash.c
+++ b/arch/x86_64/kernel/crash.c
@@ -20,9 +20,6 @@
#include <asm/nmi.h>
#include <asm/hw_irq.h>
-#define MAX_NOTE_BYTES 1024
-typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
-
note_buf_t crash_notes[NR_CPUS];
void machine_crash_shutdown(void)
diff --git a/include/asm-i386/kexec.h b/include/asm-i386/kexec.h
index a1599b5..6ed2a03 100644
--- a/include/asm-i386/kexec.h
+++ b/include/asm-i386/kexec.h
@@ -25,4 +25,9 @@
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_386
+#define MAX_NOTE_BYTES 1024
+typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
+
+extern note_buf_t crash_notes[];
+
#endif /* _I386_KEXEC_H */
diff --git a/include/asm-x86_64/kexec.h b/include/asm-x86_64/kexec.h
index dc33646..42d2ff1 100644
--- a/include/asm-x86_64/kexec.h
+++ b/include/asm-x86_64/kexec.h
@@ -25,4 +25,9 @@
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_X86_64
+#define MAX_NOTE_BYTES 1024
+typedef u32 note_buf_t[MAX_NOTE_BYTES/4];
+
+extern note_buf_t crash_notes[];
+
#endif /* _X86_64_KEXEC_H */
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 1f064a6..015fb69 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -30,6 +30,16 @@
KERNEL_ATTR_RO(hotplug_seqnum);
#endif
+#ifdef CONFIG_KEXEC
+#include <asm/kexec.h>
+
+static ssize_t crash_notes_show(struct subsystem *subsys, char *page)
+{
+ return sprintf(page, "%p\n", (void *)crash_notes);
+}
+KERNEL_ATTR_RO(crash_notes);
+#endif
+
decl_subsys(kernel, NULL, NULL);
EXPORT_SYMBOL_GPL(kernel_subsys);
@@ -37,6 +47,9 @@
#ifdef CONFIG_HOTPLUG
&hotplug_seqnum_attr.attr,
#endif
+#ifdef CONFIG_KEXEC
+ &crash_notes_attr.attr,
+#endif
NULL
};